The landing gear on a mockup of a Northrop Grumman unmanned aircraft is seen in San Diego

 
The landing gear on a mockup of a Northrop Grumman unmanned aircraft is seen in San Diego
The landing gear on a mockup of a Northrop Grumman X-47B long-range, high endurance unmanned aircraft is seen during the Naval Aviation Centennial event at Naval Air Station North Island in San Diego, California February 11, 2011. REUTERS/Mike Blake